基于CO_2跨临界循环的冷热电联供系统热力学分析  

Thermodynamic Analysis of Combined Cooling,Heating and Power System with CO_2 Transcritical Cycle

作　　者：张新铭[1,2] 张春辉[1] 游飞[1] 

机构地区：[1]重庆大学动力工程学院,重庆400030 [2]重庆大学低品位能源利用技术及系统教育部重点实验室,重庆400030

出　　处：《动力工程学报》2013年第3期239-244,共6页Journal of Chinese Society of Power Engineering

基　　金：国家重点基础研究发展计划资助项目(2011CB710701);重庆大学"211工程"三期建设资助项目(S-09101)

摘　　要：基于低品位能源利用冷热电联供技术,以常规燃煤电厂排出温度为150℃的烟气为余热利用对象,提出了CO2跨临界循环冷热电联供系统模型,分析了膨胀机入口压力和温度等参数对系统性能的影响.结果表明:压缩机入口过热度对系统性能系数、经济性能系数的影响很小;系统性能系数随着高压膨胀机入口压力、低压膨胀机入口温度和膨胀机效率的升高而增大,随着高压膨胀机入口温度、低压膨胀机入口压力和制冷蒸发温度的升高而减小;系统总不可逆损失随着高压膨胀机入口压力的升高存在最小值.A model of combined cooling, heating and power （CCHP） system with CO2 transcritical cycle was proposed by using the low-grade energy utilization/CCHP tri-generation technology and by taking 150 ℃ exhaust flue gas from conventional coal-fired power plant as the heat resource, based on which influences of following factors on the system performance were analyzed, such as the inlet pressure, inlet temperature of the expander, etc. Results show that the compressor＇s inlet superheat degree affects little on the thermal economic coefficient of system; the coefficient of thermal performance increases with rising inlet pressure of high-pressure expander and inlet temperature of low-pressure expander, and with reducing inlet temperature of high-pressure expander, inlet pressure of low-pressure expander and evaporator temperature; a minimum irreversible loss exists in the rise of inlet pressure of high-pressure expander.

关 键 词：低品位能源 CO2跨临界循环 冷热电联供 热力学分析 

分 类 号：TK123[动力工程及工程热物理—工程热物理]